840409003 has 4 divisors (see below), whose sum is σ = 960467440. Its totient is φ = 720350568.

The previous prime is 840409001. The next prime is 840409013. The reversal of 840409003 is 300904048.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 840409003 - 2¹ = 840409001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840409001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60029208 + ... + 60029221.

It is an arithmetic number, because the mean of its divisors is an integer number (240116860).

Almost surely, 2^840409003 is an apocalyptic number.

840409003 is a deficient number, since it is larger than the sum of its proper divisors (120058437).

840409003 is a wasteful number, since it uses less digits than its factorization.

840409003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120058436.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 840409003 is about 28989.8086057842. The cubic root of 840409003 is about 943.6919101827.

The spelling of 840409003 in words is "eight hundred forty million, four hundred nine thousand, three".